What would be the first thing you'd have noticed about each of them?
Edward - His eyes. Just the way he stares at you.
Carlisle - The way his.. beauty mixes with his age. -that doesn't sound like it makes sense- His physical beauty and.. mental age. And how you can see his age in his eyes. (i know, i have problems)
Esme - I'd say her size. She's so small, you don't usually notice because Alice is usually thought of as the tiny one. Oh wait, I take it back, I'd notice Carlisle next to her. Haa.
Alice - Her hair. For sure.
Jasper - His black eyes.
Rosalie - Her beauty. And the way her mouth is always in a hard line.
Emmett - His size. Then his eyes. You know they way his eyebrows and his eyes.. I can't explain it. Or the way his black hair looks against his pale skin.